ajv-ftl-i18n/transpile.js

Transpile Fluent (ftl) files into ajv error translations.

// Copyright 2026 will Farrell, and ajv-ftl-i18n contributors.
// SPDX-License-Identifier: MIT
import fluentTranspile from "fluent-transpiler";

const exportDefault = `(errors) => {
  if (!errors?.length) return
  for (const e of errors) {
    let { keyword } = e
    if (keyword === 'false schema') keyword = 'falseSchema'
    let source = __exports[keyword] ?? __exports['_'+keyword]
    let values = {}
    if (keyword === 'errorMessage') {
      const [message, ...valuesPairs] = e.message.split(', ')
      for (const [, key, value] of valuesPairs.join(', ').matchAll(regExpJsonPointerPairs)) {
        values[key] = value.replace(regExpJsonPointerQuote, '')
      }
      source ??= __exports[message] ?? __exports['_'+message] ?? e.message
    } else {
      source ??= __exports.defaultMessage
    }
    if (typeof source === 'function') {
      e.message = source({keyword:e.keyword, ...e.params, ...values})
    } else {
      e.message = source
    }
  }
}
const regExpJsonPointerPairs = /([a-zA-Z0-9_-]+):("[^"]*"|[^,"]+)/g
const regExpJsonPointerQuote = /(^"|"$)/g
`;

export default (ftl, options) => {
	const originalError = console.error;
	console.error = Function.prototype;
	try {
		return fluentTranspile(ftl, {
			comments: false,
			...options,
			exportDefault,
		});
	} finally {
		console.error = originalError;
	}
};